Embedding virtual test points in PCBs

Boundary scan is currently the most popular diagnostic tool for high performance systems and plays a key role in overcoming hesitation for using fine pitch packaging. The hands-on test philosophies of the past are transcended with the ability to test a complex circuit internally and externally from a computer terminal. There is a realization that JTAG will quickly pay for itself by reducing the test and integration time. JTAG acceptance continues to increase with the introduction of more boundary scan devices. Major breakthroughs in integrated circuit design, such as Quality Semiconductor´s QuickScan Technology, add endless alternatives for implementing JTAG in a system. QuickScan devices give the designer immediate JTAG coverage without the common performance penalty